diff --git a/remotefilelog/remotefilelog.py b/remotefilelog/remotefilelog.py
--- a/remotefilelog/remotefilelog.py
+++ b/remotefilelog/remotefilelog.py
@@ -253,8 +253,14 @@
             p1, p2 = self.parents(node)
             if prevnode is None:
                 basenode = prevnode = p1
-            revision = None
-            delta = self.revdiff(basenode, node)
+            if basenode == node:
+                basenode = nullid
+            if basenode != nullid:
+                revision = None
+                delta = self.revdiff(basenode, node)
+            else:
+                revision = self.revision(node, raw=True)
+                delta = None
             yield revlog.revlogrevisiondelta(
                 node=node,
                 p1node=p1,